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Depression of the energy gap at a surface in 3He-B; the evidence from thermal boundary conductance

Research output: Contribution to journalLetter


Journal publication date20/06/1986
JournalJournal of Physics C: Solid State Physics
Number of pages6
Original languageEnglish


A simple expression for the heat flux between sintered silver powder and 3He-B is derived. The heat flux in the superfluid state is expressed in terms of that in the normal state, without the precise mechanism of heat transfer needing to be specified. A comparison with recent measurements suggests that the energy gap involved is a factor of 0.65 of the bulk value. This implies that the gap is depressed near a boundary and that processes occurring close to the boundary dominate the thermal exchange mechanism.